1、Made of high quality zinc alloy, durable and rustproof. 2、Unique external thread makes it insert hole easily and save effort. 3、External thread ensures strong resistance against pull out 4、Flanged head prevents splitting of the surfaces and driving the insert too deeply. 5、Provide a strong permanent thread for wood and wood based sheet materials. Features: Made of high quality zinc alloy, durable and rustproof. Unique external thread makes it insert hole easily and save effort. External thread ensures strong resistance against pull out Flanged head prevents splitting of the surfaces and driving the insert too deeply. Provide a strong permanent thread for wood and wood based sheet materials.   Specifications: Quantity: 50pcs Color: As pictures show Material: Zinc Alloy Model: M5 Length: 1.3cm/ 0.51in Hex Width: 0.3cm/ 0.12in Weight: Approx. 134g   Package included: 50 x Hex Drive Head Nut Note: Please allow 1-3mm error due to the manual measurement. Thanks for your understanding.